GPX-Tracks中的交替颜色 [英] Alternating colors in GPX-Tracks

问题描述

这个问题涉及：如何总结，将4000+ GPX Trackpoints作为每天的日期命名的轨道？

Garmin GPS轨道提供了选项为每个轨道定义一个不同的颜色。

Garmin GPS-Tracks provide the option to define a different color for each track.

作为引用问题结果的完善，我想知道如何为每个GPS轨道应用交替颜色。例如第一个。赛道（当天的所有赛道点）均为第二级的洋红色。一天是着色的'DarkGray'和第三天。日再次'洋红'。

As a perfection to the result of the referring question, I wonder how to apply alternating colors for each GPS-track. For instance the 1st. track (all trackpoints for that day) are colored 'Magenta' the 2nd. day is colored 'DarkGray' and the 3rd. day again 'Magenta'.

使用节点（日期）在奇数或偶数天之间交替使用通常会在2天内产生相同的颜色。例如：3月31日至4月1日。会收到相同的颜色。

Using the node (date) to alternate between odd or even days would often produce the same color for 2 days. For example: March 31 to April 1st. would receive the same colors.

颜色适用于节点：< gpxx：DisplayColor>

Colors apply to the node: <gpxx:DisplayColor>

如何通过代码实现在引用问题的答案中提供了什么？

How can this be achieved using the code provided in the answer of the referring question?

<trk>
<name>ACTIVE LOG</name>
<extensions>
  <gpxx:TrackExtension xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3">
    <gpxx:DisplayColor>Magenta</gpxx:DisplayColor>
  </gpxx:TrackExtension>
</extensions>
<trkseg>

推荐答案

您可以将位置（）加2并检查是否有余数。

You can divide the position() by 2 and check to see if there is a remainder.

<xsl:stylesheet version="1.0" 
    xmlns="http://www.topografix.com/GPX/1/1" 
    xmlns:gpx="http://www.topografix.com/GPX/1/1" 
    xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    exclude-result-prefixes="gpx">
    <xsl:output indent="yes" encoding="utf-8"/>
    <xsl:strip-space elements="*"/>

    <xsl:key name="date" match="gpx:trkpt" use="substring(gpx:time,1,10)"/>

    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="/*">
        <xsl:copy>
            <xsl:apply-templates select="@*"/>
            <xsl:for-each select="//gpx:trkpt[generate-id(key('date',substring(gpx:time,1,10))[1])=generate-id()]">
                <trk>
                    <name>Trackpoints: <xsl:value-of select="substring(gpx:time,1,10)"/></name>
                    <extensions>
                        <gpxx:TrackExtension>
                            <xsl:choose>
                                <xsl:when test="position() mod 2 = 1">
                                    <gpxx:DisplayColor>Magenta</gpxx:DisplayColor>                                    
                                </xsl:when>
                                <xsl:otherwise>
                                    <gpxx:DisplayColor>DarkGray</gpxx:DisplayColor>
                                </xsl:otherwise>
                            </xsl:choose>
                        </gpxx:TrackExtension>
                    </extensions>
                    <trkseg>
                        <xsl:for-each select="key('date',substring(gpx:time,1,10))">
                            <xsl:copy-of select="."/>
                        </xsl:for-each>
                    </trkseg>
                </trk>
            </xsl:for-each>
        </xsl:copy>        
    </xsl:template>

</xsl:stylesheet>

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